Centrifugal sieving apparatus.



PATENTED APR. l0, 1906.

H. L. GERMAN.

GENTMFUGAL SIEVING APPARATUS.

APILIUATION FILED AUG. 7, 1905.

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INVENTOR WITNESSES No. 817,333. PATENTED APR. 10, 1906.

f H. L. GERMAN.

CENTRIPUGAL SIEVING APPARATUS.

APELIOATION FILED AUG. 7, 1905.-

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HJALMAR L.' osRMAN-,or .DAYTomomo l cENTnlFuG'ALfsIEvINQ A'PPAnAjrus.

i Specification of Letters Patent. 1

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To all whom itmay concern:

Beit known that I HJALMAR L. QRRMAN, a citizen of the United States ofAmerica, and a resident of Dayton, in the county of Montgomery and Stateof Ohio, have invented certain new and useful Improvements. 1nCentrifugal Sieving Apparatus, of which the following is a specicatlon.

My invention relates to that class of machines in which centrifugalforce is employedV 4to throw the material to be sleved upon a screen. lv t The invention is an improvement upon the Ruth machine as set forth1n hls Patent No.

781,097, of January 31, 1905., and assigned to One of the objects of theinvention is to provide a com act compound screening` machine that Wilnot only eflicientl serve for screening ground wood, sulfite, so aiiber, andcellulose, but will serve also for screen* ing paper-stockjustbefore it enters the paper-making machine. As usual, the materialcontains water during the operation of converting it into a liquid pulp.

Another object is to provide against lossof useful fiber that might bethrown away with the tailings. V By my invention also-I am able to savespace, piping, power, and attendance, and as a consequence of theobjects gained there is reduced cost of manufacture and operation.'

Without regard to the various scopes of novelty which are attended to inthe clalms the general nature of the invention comprises i an`arrangement by which the. whole screening process is performed andrepeated in one piece of apparatus, whichconsists, essentially, of avertical shaft, rota 4beaters, in sets which are at dierent leve s and`attached to said shaft, troughs at each set of beaters for catching thescreened material, a pipe co`n` necting the said troughs to a. commondelivery-pipe, troughs for the talhngs at the respective sets ofbeaters, a pipe connecting the `upper one of the last-named troughs tothe next lower beaters, and an outlet-pipe for the lowesttailings-trough.

The machine will now be described by reference to the accompanying.drawings. j

Figure 1 represents a general vertical central section. at about theline'l 1 of Fig. 1. Fig.3 is a vertical section on the line 2 2 of 2,but with the beaters 3a in a different. position.

Fig. 4 is a general outline of the machine and ave a projecting rim 26,wit

Fig. 2 is ahorizontal section the locking'device for thesieverum. Fig.A

6 is an enlarged viewwfromv adifferent direction, of the lcking devicefor the sieve-drum, being avertical section about on the line 5.5 ofFig. 6.

.As noticed, many elements in the upper part of the machine are likethose in the lowerfrom the exterior 4in elevation, with portions 'l FI11s an enlar ed viewof part and are therefore. numberedv somewhatIsimilarl by adding a ""after the referencenumeras applied to the lowerpart ofi the figures. will describe ,the upper portion y 7o y,

the beater with about the same inclination i lrelatively to the shaft asthat of the surface v of the conical runner l5. The channel 6 grad?lward and outward a ong the whole length of ually lessens in depth froma maximum at the top tonothingat the bottom, owing to the slightinclination ofthe beaters 3 to the vertical bottom of th'esaid channel,as most clearly seen in Fi .'3. At thetop there is an inlet-pipe 7, whicextends throu h the cover B of the sieve-drum and throu the cover C ofthe casing 1. The lower en of the inletwhich is a. deflector 9,`by whichthe inlet from the pipe4 7 becomes annular and terminatesV just abovethe beaters 3 and-directly op osite the `upper ends of the channels 6.he radial dimension of this annular passage-way between theelements 8and 9 is only a little pipe 7'is spread out into a hood 8, central withless than the widthof the channels 6, so that the pulp is delivered inla circular stream directly into the.l channels 6. p,

-At the foot of the drum-2 are two troughs concentric to each otheraround the shaft'4..

The trough 11 is on the inside of .this-drum 2, and thetrough 10 is onthe outside. v'These trou hs 104 and 11 are'all in a singllJ casting 'nwhich ts the sieve-drum 2, and a ring 27, so that' the sieveis betweenthe lattertwo arts. The ring 27 carries a screw-pin 28, w 'ch is held4down by the lookin -piece 29, .which projects4 over the pin 28. lhe rim26 is notched, so

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that the ring 27 by being turned Vmay cause the pin 28 to escape fromsaid notch, and thus release the drum 2. Screws 3() hold thelockingpiece 29 permanently across a part of said notch. Caution shouldbe taken to have the notch in such a direction under the lock-Aing-piece 29 that any clogging of the pulp between the `beaters -3 andthe screen 2 lwill twist the screen in a direction opposite to thatrequired for wholly removin the sieve-drum. Before I provided this locin device the sieve-drum 2 was occasionally hfted and displacedfrom itsproper position by the action of 'the pulp. There are several suchlocking devices.

From the bottom of the'trough 1l leads an outlet-pipe 19 horizontallyand radially inward to such a distance that when it is bent down againvertically its vertical axis about coincides with the axis of the shaft4. Accordingly there is a stuffing-box 21 on the upper "de of the pipe19 for the' shaft 4. The lower end lof the pipe 19 terminates in a hood8a, which surrounds a conical deflector 9a, just above a conical runner5 for supporting radial beaters 3a, having channels 6a.

All the other parts having a reference-numeral followed by a are similarto those already described having the same referencenumerals without theletter a.

The trough 10 is provided with an outletpipe 12, connecting with a pipe14, which passes down to communicate with the pipe 24, which also joinsthe outlet-pipe 12a o t e trough 10u. The trough 11a has a finaloutlet-pipe 13.

The gear-wheels 15 drive the shaft 4 and are driven bythe pulleys 32.

Pillars 23 have brackets 22 supporting the upper screening-machine bybeing locatedv under the trough 10, while the brackets 22a on saidpillars are under the trough 10a. The pillars 23 are on a base-plate 33.

If desired, a pipe 18 may be led into the trough 11 and 11L forintroducing water for washing out the tailings.

A valve 3 5 is provided in an extension of the pipe 7 forr regulatingthe entrance of the pulp.

A pipe 20, opening into the pipe 19, is provided for adding more waterto the tailings passing through the pipe 19, as otherwise they areliable to be too dry to properly rescreen.

Having described the construction, I will now set forth the operationand utility of the different parts. In the first place the paperstock orany kind of pulp iows past the valve 35 into the pipe 7, then passes byan annular path between the deflector 9 and the hood 8, whereby thevpulp is directed from an axial travel and is ldistributed in a circularstream to the various channels 6, which are rotating with the beatersthrough the action of the shaftv4, the pulp being thrown out against thescreen 2 and spread thereon uniformly,

whence the pulp flows down both' sides of the before, to the troughs 10aand 11a. The taili ings fallin to the trough 11a are now exhausted ofgoo fiber andhave their. exitv throu h the pipe 13, While the rescuedus'ful pu p finds its way through the pipe 12a, where it joins thematerial going out of the pipe 24.

In the sin 1e type of screening-machine there is the isadvantageexisting that the tailings separated b the screening process carry withtheml a large amount vof useful pulp or paper-stock, which must be lostor recovered by an entirely separate machine. By my invention therotation of one shaft causes complete separation, thereby saving gearinconnections, space, securing convenience, an producin a compoundapparatus which may be manu actured and shipped as one article.

It is apparent that my invention may be modified in certain detailswithout departing from the scope thereof as attended to in the claims.

I will now explain more particularly an advantage of the invention,especially with reference to the offset 20. In .the first place all thepulp and paper-stock and the water connected with it go through thescreens and should not be admitted to. the paper-making machine exceptthrough the screens. On the paper-machine most of the water separatesfrom the pulp, and this water is usually saved and called the backwatenIt usually contains some fiber, china-clay, size, &c.,' and asheretofore practiced is pumped up into a vessel placed on a higher levelthan the screens. From this vessel the backwater is run back to thescreens in the proportion reuired to make thepaper in question, and ifffhere is more of this backwater than required it is run away or savedand used in some manner not connected with the screening process. Suchis the usual method of operating independent of what kind of screens areemployed.

By employing the connecting-pipe 19 and the offset 20 in the combinationset forth it allows me to admit the backwater through the odset 20, sothat I can regulate the flowage on the paper-machine. I am aware that itis old to use the backwater and the fiber it contains over again; but inmy invention I admit the backwater exactly in the proper place. Withoutthe pipe 19 the compound IOC IIO

\ hold that the backwatermust be used.

screen could not be worked raeticall and without the offset 2() itwoulil not fu fil the proper requirements. The tailings from the upperscreen need water to be first thinned out and then rescreened. Commonfresh water would serve as well. for that pur ose; but paper-makerswouldnot consent. lfhiey much as is required to secure the proper flowage in the paper-machine is admitted through the ol'l'set 20, and thisamount of backwater is far in excess of what the tailings would refromthe beaters; troughs at the foot of said drum and located respectivelyinsidel and outside of the same for receiving res ectively the tailingsand screened portion o the material, a second set of beaters, a drum,and two troughs like the first named, a common delivery-pipe for thetroughs that are for the screened material from the two drums, a pipeconnecting-the firstnamed trough for the tailings with the second-namedset of beaters for feeding the tailings to these lastmentioned beaters,a discharge-pipe for the second-named trough for the tailings, a shaftfor driving both sets of beaters which are rigidly connected to saidshaft, and a driver for said shaft. p

2. The combination of a vertical shaft, a driver therefor, an upper andlower set of beaters connected to and driven by said shaft, screens oposite the beaters for receiving any materia thrown off by centrifu alaction by said beaters, a pipe connection or conveying the tailings fromthe upper machine to the beaters of the lower machine, and a pipe forconveying the screened material from the u per machine to join thescreened materia from the lower machine.

3. The combination of a vertical shaft, a driver therefor, an upper andlower set of beaters connected to and driven by said shaft, screensopposite the beaters for receiving any material thrown off bycentrifugal action by said beaters, la pipe connection for conveying thetailings from the upper machine to the beaters of the lower machine, a

ipe for 'conveying the screened material fiom the upper machine to jointhe screened material from the lower machine, casinvs surround ing bothmachines, posts, and bracliets on the posts supporting the respectivemachines.

4. The combination of a vertical shaft, a driver therefor, an upper andlower set of beaters connected to and drivenby said shaft, screensopposite the beaters for receiving any material thrown off bycentrifugal action by said beaters, a pipe connection for conveyingr thetailings from the upper machine to the beaters of the lower machine, apipe for conveying the screened material from the upper machine to jointhe screened material from the lower machine, sieve-drums for saidmachine, rngssupporting said drums, castings .having rims for holdingone of said rings in each machine, and locking devices connecting saiddrums to said rims.

5. In a centrifugal sieving apparatus the combination of a casinghaving-a bearing, a sieve-drum in 4said bearing, a pin fastened to thedrum, said casting having a notch, a projection over a ortion of thenotch, and said pin extending into said notch.

6. In a centrifugal sieving apparatus, the combination fof two'castings, one directly abovethe other, a sieve-drum within eac casing, aset of rotating beaters within each sieve-drum, for receiving thematerial to be .acted upon and delivering the same by centrifugal actionto the said sieve-drums respec tively, a vertical shaft common to bothsets of beaters, the said beaters being fixed upon and driven by saidshaft, a frame common to and supporting both of said casings and havingbearings for said shaft, an inlet in the top of the upper casing, fordelivering the material to within the sieve-drum andv to the u per setof beaters, a pipe for delivering t e tailings from the u per sieve-drumto the beaters within the ower casing land sievedrum, another (pipejoining the first named, for supplying a ditional water to the tailingstherein, a final outlet in the lower easing for the tailings from thelower sieve-drum, an outlet in the lower casing for the screenedmaterial, and a pipe for conveying the screened material from the uppercasing and adding it to the screened material issuing from the outlet ofthe lower casing.

7. In a centrifugal sieving apparatus, the combination of a casing, asieve-drum within the casing, a set of rotating beaters Within thesieve-drum, a second group of elements like the above named, the twogroups being located one above the other, a common shaft upon which saidtwo sets of beaters are fixed and by which they are driven, a framecommon to and vsupporting both said easings and having bearings for thesaid shaft, an initial inlet for supplying material to the upper set ofbeaters, a passage for conveying the tailingsfrom the upper sieve-drumto the lower set of beaters, a final outlet for the tailings from thelower sieve-drum, means for conveying the screened material from theupper sieve-drum to join that from the lower sievedrum,'and a commondelivery for the admixture of screened material from the twosieve-drums.

8. The combination of a shaft, a driver therefor, an upper and'lower setof beaters IOO IIO

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connected to and `driven by said shaft, screens opposite the beaters forreceiving any materia thrown .off by centrifugal action from saidbeaters a pipe for conveying the tailings from the u er machine to thebeaters of the lower mac lne, an offset pipefrom the :firstnamed pipefor receiving'water to thin the tailings, from the upper machine, andoutletpipes for the lower machine.

9.- The combination of two screening-machines, rotating'beaters for bothmachines,`- a pipe for conveying` the tailings from one machine to thebeaters of the second machine, and an offset from said pipe forreceiving water. i A

In testimony whereof I have hereunto signed my naine,- in the presenceof two subscribing witnesses, this 2d day of August,

RoBT. C.- PATTERSON, EDITH BANKER.

